Commissioner Elizabeth Denham is pursuing a warrant to search Cambridge Analytica’s servers. She has also asked Facebook to cease in its efforts to pursue its own audit of Cambridge Analytica’s data use.

“Our advice to Facebook is to back away and let us go in and do our work,” she said. Cambridge Analytica said it is committed to helping the U.K. investigation. However, Denham gave the firm a deadline to produce the information she requested — and it failed to meet it, her office said.

Denham said the prime allegation against Cambridge Analytica is that it acquired personal data in an unauthorized way, adding that the data provisions act requires platforms like Facebook to have strong safeguards against misuse of data.

Chris Wylie, who once worked for Cambridge Analytica, was quoted as saying the company used the data to build psychological profiles so voters could be targeted with ads and stories. The firm found itself in further allegations of wrongdoing. Britain’s Channel 4 used an undercover investigation to record Cambridge Analytica’s chief executive, Alexander Nix, saying that the company could use unorthodox methods to wage successful political campaigns for clients.

He said the company could “send some girls” around to a rival candidate’s house, suggesting that girls from Ukraine are beautiful and effective in this role. He also said the company could “offer a large amount of money” to a rival candidate and have the whole exchange recorded so it could be posted on the internet to show that the candidate was corrupt.

Nix says in a statement on the company’s website that he deeply regrets his role in the meeting and has apologized to staff. “I am aware how this looks, but it is simply not the case,” he said. “I must emphatically state that Cambridge Analytica does not condone or engage in entrapment, bribes or so-called ‘honeytraps’, and nor does it use untrue material for any purposes.”